Reinforcing trussed girder



REINF'ORCING TRUSSED GIRDER Filed 0011. l2, 1955 a@ 76M@ 6 f3 4 Z0 Z0 I /6 /-a.

INVENTOR 5.GSz'mmQ72/ United States Patent j REINFORCING TRUSSED GIRDER Bowie G. Simmons, Mobile, Ala.

Application October 12, 1955, Serial No. 5395989 1 Claim. v(Cl. 72-110) This invention 'relates to a novel *reinforcing unit for precast concrete members forming structural units which are disposed with their axes substantially horizontal and in a vertical plane, for increasing theloadbearingcapacity of such members. j t

More particularly, it is an aim of the present invention to provide a reinforcing trussed girder for concrete members which may be readily formed from a section of concrete slab reinforcing mesh.

A further object of the invention is to provide a novel method of forming a reinforcing trussed girder from conventional reinforcing mesh and which will provide a substantially greater resistance to stresses and compressive forces than the conventional reinforcing mesh.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawing, illustrating a presently preferred embodiment thereof, and wherein:

Figure l is a section or piece of conventional concrete slab reinforcing mesh cut preparatory to its conversion into a reinforcing trussed girder, shown in plan or elevation;

Figure 2 is a plan or elevational view showing the reinforcing mesh after being drawn and welded to form a reinforcing trussed girder;

Figure 3 is a perspective view showing a cutoff end of a precast concrete structural member and in which one end of the trussed girder is embedded, the other end thereof being shown exposed, and

Figure 4 is an enlarged fragmentary cross sectional view, taken substantially along a plane as indicated by the line 4 4 of Figure 2.

Referring more specifically to the drawing, a section or piece of conventional reinforcing mesh, such as is used for reinforcing precast concrete members, is illustrated in Figure l and is designated generally 6. However, the section or piece 6 is modified in that portions of the rods forming the mesh are cutaway adjacent the center thereof. The mesh piece 6 includes an intermediate vertical or cross rod 7 interposed between vertical or cross rods 8 and 8a which are in turn disposed between vertical or cross rods 9 and 9a. The piece 6 also includes additional vertical rods 10, 11 and 12 disposed beyond the vertical or cross rod 9, and a, 11a and 12a, disposed beyond the vertical or cross rod 9a. The piece 6 also includes longitudinal or horizontal rods 13, 14, and 16. The longitudinal or horizontal rods are secured to the vertical or cross rods at the junctions thereof.

A short piece is cut out of the longitudinal rod 14, intermediate of its ends, so that adjacent end portions 14a and 14h thereof terminate between the cross rod 7 and the adjacent cross rods 8a and 8, respectively. A longer piece is cut out of the intermediate portion of the longitudinal rod 15 so that the adjacent cutoff ends 15a and 15b thereof terminate inwardly with respect to and adjacent the cross rods 9a and 9, respectively. A still longer section is cut out of the intermediate portion of 2,814,943 Patented Dec. v3, 11.9157

2 the rod 16 so that the adjacent end portions 16a and 1 6b thereof are spaced apart a distance greater than the spacing between the cross rods 9 and 9a and less than the spacing between the cross rods 10 and 10a.

The intermediate cross rod 7 is cutoff substantially midway between the rods 14 and 15 so that it is supported by and connected only to the uncut'upper longitudinal rod 13. The rods 8 and 8a are cut olf lbetween the rods 14 and 15`and adjacent said rod 14; and the rods 9 and 9a are cut off between the rods 15 and 16 and adjacent said rod 15, all as clearly illustrated in Figure l.

The rod ends 14a and 14b,y 15a and 15b and 16a and 16b are 'then drawn inwardly toward Vone another and into overlapping relation relative to oneva-nothzer, 4as illustrated in Figure 2. This drawing inwardly of the inner ends of the rods 14, 15 and 16 also causes an inward bending of all of the cross r'odsexcept the center cross rod 7 so that the Icross rods 8 and 8a, 9`ar1d 9a, 10 -and 10a, 11 and l11a and L12 and 12a are tli'en disposed in downwardly and inwardly converging relation to one another, as seen in Figure 2. As a result of this, the rods 14, 15 and 16 are displaced toward one another and toward the unmodied upper longitudinal rod 13 while retaining their substantially parallel relation. Accordingly, by this displacement of the longitudinal rods toward one another, the cut off intermediate cross rod 7 intersects and forms junctions with the overlapping portions of the rods 14, 15 and 16. The overlapping rod portions 14 and 14a are then welded to one another and to the rod 7 and the rod portions 15a and 15b and 16a and 16h are likewise welded to one another and to the intermediate cross rod 7 as seen at 23 to thus complete the reinforcing trussed girder, as seen in Figure 2 and designated generally 17. Where additional reinforcing is desired, a rod 18 may be welded to the rod 16, as seen in Figures 2 and 3.

If desired, short anchoring rods 19 of anchoring units as disclosed in my co-pending application entitled Precast Concrete Structural Unity, Serial No. 536,659, filed September 26, 1955, may be secured to the rod 13, as illustrated in Figures 2, 3 and 4, and similar short anchoring rods 20 may be secured to t-he lower rod 16 or the reinforcing rod 18, said anchoring rods 19 and 20 having outwardly offset intermediate portions which can assume exposed positions relative to top and bottom edges of a precast concrete member in which the trussed girder 17 is molded.

One end of the trussed girder 17 is shown molded in a wall or side 21 from which the adjacent end portion has been cut off, and which wall or side 21 forms a part of an angular structural unit as fully disclosed in my aforementioned co-pending application. It will be understood that the entire trussed girder 17 will be molded into the wall or side 21 so as to be completely embedded therein with the exception of the offset intermediate portions of the anchor rods 19 and 20. It will also be understood that the length and width of the girder 17 may be varied by utilizing pieces of mesh 6 of different sizes. Thus, the girder 17 may include a greater number of longitudinal and cross rods than as illustrated in Figures 1 to 3.

The trussed girder 17 is adapted to be utilized in any precast structural member intended to be disposed with its axis substantially horizontal and in a vertical plane, as illustrated by the wall or side 21 in Figure 3, so that said reinforcing girder 17 is disposed with the plane thereof substantially vertical. The girder 17 will thus effectively function to materially increase the load bearing capacity of a precast member in which it is embedded. The girder 17 may be disposed, as illustrated in Figure 3, with the longitudinal rod 13 constituting the upper edge thereof, or may be disposed in an inverted position with the rod 13 constituting the bottom portion thereof.

From the foregoing it will be apparent that a novel reinforcing girder for precast 4concrete members has been provided, as well as a novel method of producing such a reinforcing girder from a piece of conventional rod mesh of the type normally employed for reinforcing concrete slabs.

Various modications and changes are contemplated and may obviously be resorted to, without departing from the spirit or scope of the invention as hereinafter defined by the appended claim.

I claim as my invention:

A reinforcing trussed girder adapted to be embedded in a precast structural member, said girder being formed of rod mesh and consisting of a plurality of substantially parallel longitudinal rods including an outermost longitudnal rod, an intermediate cross rod secured to and extending continuously across intermediate portions of al1 of said longitudinal rods, and a plurality of diagonal rods disposed on each side of said intermediate cross rod, said diagonal rods being disposed in downwardly and inwardly converging relation to the intermediate cross rod and each extending continuously across and being secured to the outermost longitudinal rod and to one or more of the other longitudinal rods, the diagonal rods which are disposed remote from the intermediate cross rod being secured to all of the longitudinal rods, all of said longitudinal rods, except said outermost longitudinal rod, being formed of end sections having adjacent end portions secured to said intermediate cross rod and secured to one another in overlapping relation.

References Cited in the le of this patent UNITED STATES PATENTS 843,726 White Feb. 12, 1907 1,081,647 Wolhaupter Dec. 16, 1913 1,405,654 Wrissenberg Feb. 7, 1922 1,674,086 Barton June 19, 1928 2,256,812 Miller Sept. 23, 1941 2,277,615 Townsend Mar. 24, 1942 FOREIGN PATENTS 368,093 Germany Jan. 3l, 1923 580,037 France Aug. 20, 1924 555,038 Germany July 15, 1932 

